Dragon Quest head honcho Yuji Horii has revealed at the Unreal Fest East 2017 event that the Switch version of Dragon Quest XI will use Unreal Engine 4.
The Nintendo version is running on Unreal Engine 4.15, whereas the PlayStation 4 edition is running on 4.13 - a fact which goes some way to explaining the rumoured development issues we've been hearing about.
Unreal Engine 4 has been supported by Sony's console for some time - hence the fact that it's been built on an older version - while the support on Switch is relatively new. The fact that the two versions are running on different builds of the engine seems to be causing some headaches for the development team.
Dragon Quest XI on Switch doesn't have a release date as yet, but the PS4 version is expected to launch globally next year.